package com.mall.order.biz.handler;

import com.alibaba.fastjson.JSON;
import com.mall.commons.tool.exception.BizException;
import com.mall.order.biz.context.CreateOrderContext;
import com.mall.order.biz.context.TransHandlerContext;
import com.mall.order.constant.OrderRetCode;
import com.mall.order.dal.entitys.Stock;
import com.mall.order.dal.persistence.OrderItemMapper;
import com.mall.order.dal.persistence.StockMapper;
import com.mall.order.dto.CartProductDto;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

/**
 * @Description: 4扣减库存处理器
 * @Author： wz
 * @Date: 2019-09-16 00:03
 **/
@Component
@Slf4j
public class SubStockHandler extends AbstractTransHandler {

    @Autowired
    private StockMapper stockMapper;

	@Override
	public boolean isAsync() {
		return false;
	}

	@Override
	@Transactional
	public boolean handle(TransHandlerContext context) {
		CreateOrderContext createOrderContext = (CreateOrderContext) context;
		List<CartProductDto> dtoList = createOrderContext.getCartProductDtoList();

		List<Long> productIds =new ArrayList<>();
		for (CartProductDto cartProductDto : dtoList) {
			productIds.add(cartProductDto.getProductId());
		}
		productIds.sort(Long::compareTo);
		List<Stock> stockList = stockMapper.findStocksForUpdate(productIds);
		if (stockList == null) {
			throw new BizException(OrderRetCode.DB_EXCEPTION.getCode(),OrderRetCode.DB_EXCEPTION.getMessage());
		}
		if(stockList.size()!=productIds.size()){
			throw new BizException(OrderRetCode.DB_EXCEPTION.getCode(),OrderRetCode.DB_EXCEPTION.getMessage());
		}
		for (CartProductDto cartProductDto : dtoList) {
			Long productId = cartProductDto.getProductId();
			Long productNum = cartProductDto.getProductNum();
			//TODO   productNum 限购的要判断
			for (Stock stock : stockList) {
				Integer restrictCount = stock.getRestrictCount();
				if (productNum > restrictCount) {
					throw new BizException(OrderRetCode.DB_EXCEPTION.getCode(),OrderRetCode.DB_EXCEPTION.getMessage());
				}
			}
			Stock stock = new Stock();
			stock.setItemId(productId);
			stock.setStockCount(-productNum);
			stock.setLockCount(productNum.intValue());
			stockMapper.updateStock(stock);
		}
		return true;
	}
}